Ignition coil



April 9, 1929. R. l. BATES IGNITION COIL Filed Dec. .20, 1926 Patented Apr. 9, 1929. 7'

Unrrsn snares nr oreien RALPH I. BATES, O F DAYTON, OHIO, ASSIGNOB TO DELCQ-REMY CORPORATIOILOF DAYTQN, 812110, A CORPORATION OF. DELAWARE.

IGNITION COIL.

Application filed December 20, 1926. Serial No. 155,777. f

,The present invention relates to improvements in induction coils and particularly such coils used for providing ignitionfor motor vehicle engines.

It is among the objects of the present invention to provide a coil which will operate efficiently and quietly and which may be inexpensively produced.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein a pref-erred embodiment of one form of the present invention is clearly shown.

In the drawings y Fig. 1 is a section taken longitudinally of the coil. 1

Fig. 2 is an end view of the coil taken from the right of Fig. 1.

Referring to the drawing, the numeral 20 designates the metallic core upon which is wound the primary winding 21. A sleeve 22 of insulating material surrounds this primary winding and around this sleeve the secondary winding 28 is wound. The secondary win ding is surrounded by a thin sheetof any suitable insulating material designated by the numeral 24.

Bell-shaped end covers 25 are provided over each end of the coil. These end covers may be made in any suitable manner, but for applicants purposes it is preferably formed by a pressing or molding operation from phe-' nolic condensation products such as bakelite, condensite or the like.

Each end cover 25 comprises an end portion 26 provided with a cylindrically shaped flange 27, the end portion having a central aperture which fits snugly over the core, the cylindrical flange fitting above the coil and enclosing a portion thereof.

A metallic disc is provided on the end surface oi each end cover, said disc preferably comprising sheet metal laminations centrally apertured to fit snugly about the core so as to contact therewith. A plurality of smaller apertures 29 are provided in the disc adjacent the central aperture.

hen the central portion only of the disc is secured to the end cover, the free edges of the laminations will be set in motion during the operation of the coil, such motion being caused either by the magnetic action of the coil or through vibrations oi the coil mounting, thereby causing said laminations to be noisy. To avoid this, applicant embeds certain portions ofthe disc in the end cover material when said end cover is being formed.

In the Fig. 1, it is clearly shown that the peripheral edge of the disc is embedded in a bead 30 formed about the edge of the end cover. The material of the end cover during formation of said cover, squashes through the smaller apertures29 and overlaps the outer edges of said apertures in the form oi rivet heads 31. Thus the entire peripheral edge and certain inner portions are securely anchored to the end cover and movement of the laminations of the disc is prevented.

A slot 32 formed in the disc from the central aperture to the edge, provides impedance to eddy currents tending to form in said disc.

Several of the portions of the end cover material extending through the smaller apertures 29 of the disc have passages 33 which provide conduits for the wires of the windings.

This structure provides an efiicient and quiet coil, particularly adapted for use in connection with engines of automotive vehicles, said coil being of such asimplilied design that it may be produced commercially at a minimum cost.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other ;torms might be adopted, all coming Within the scope of the claims which follow.

What is claimed is as follows V 1. An induction coil comprising in combination, a core; windings on said core; end covers for said coil; a metallic disc supported by each cover; and means for anchoring the periphery of a disc to a cover.

2. An induction coil comprising in combination, a metallic core; windings on said core; end covers of insulating material fitting about the core and over said coil; a metallic disc supported by each cover; and means provided by a cover for anchoring the periphery of a disc to acover.

3. An induction coil comprising in combination, a metallic core having windings thereon; bell-shaped end covers of moldable insulating material adapted to fit about the core and each end of the windings, and metallic discs secured to the covers by providing the covers with portions molded about the peripheries of the discs and with portions moldcover being provided with a disc of metal comprising lai'ninations which snugly lit about the core and include apertures adjacent said core said disc bein securely anchored to the outer end face or the cover by means of a portion thereof overlapping' the peri 'iheral edge of the disc and a portion of the cover material extending through and overlapping the apertures in the disc, certain of the said portion extending through the apertures being channeled to provide pastor the leads of the coil.

In testimony whereo'l I hereto afl'ix my signature.

RALPH I. BATES. 

